147. Diagram shows three concentric conducting spherical shells having Redii R ,2R and 3R. the initial potential of each shell is as mentioned in figure . choose the correct option 1. if the inneed shell is earthed, charge present on its surface would be zero. 2. if the outer shell is earthed then potential of middle would be 5 volt. 3. if the inner and outer most shells are shorted then potential of middle one would be 10 volt. 4. if the inner and Middle is shorted then energy stored in a space between these would be zero ?

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Three conducting spherical shells have radii a, b, and c such that a < b< c (Fig. 3.113). Initially, the inner shell is uncharged,the middle shell has a positive charge Q, and the outer shell has a negative charge -Q.

a. Find the electric potential of the three shells.

b. If the inner and outer shells are now connected by a wire that is insulated as it passes through the middle shell, what is the electric potential of each of the three shells? Also, what is the final charge on each shell?